Android 基础总结：（ 十二）Content Provider实例

Android API 获取通讯录中电话号码的例子

是一个读取通讯录联系人姓名和电话的实例，但由于API 2.0中，每个联系人可以有多个电话（例如手机、住宅、公司、传真等）。

import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.PhoneLookup;
import android.widget.TextView;
public class Activity01 extends Activity {
public void onCreate(Bundle savedInstanceState) {
TextView tv = new TextView(this);
String string = "";
super.onCreate(savedInstanceState);
// 得到ContentResolver对象
ContentResolver cr = getContentResolver();
// 取得电话本中开始一项的光标
Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
null, null, null);
// 向下移动一下光标
while (cursor.moveToNext()) {
// 取得联系人名字
int nameFieldColumnIndex = cursor
.getColumnIndex(PhoneLookup.DISPLAY_NAME);
String contact = cursor.getString(nameFieldColumnIndex);
// 取得电话号码
int numberFieldColumnIndex = cursor
.getColumnIndex(PhoneLookup.NUMBER);
// 此行会报错，返回值=-1
String number = cursor.getString(numberFieldColumnIndex);
string += (contact + ":" + number + "\n");
}
cursor.close();
// 设置TextView显示的内容
tv.setText(string);
// 显示到屏幕
setContentView(tv);
}
}

java代码：

import android.app.Activity;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.PhoneLookup;
import android.database.Cursor;
import android.widget.TextView;
import android.content.ContentResolver;
public class Activity01 extends Activity {
public void onCreate(Bundle savedInstanceState) {
TextView tv = new TextView(this);
String string = "";
super.onCreate(savedInstanceState);
// 得到ContentResolver对象
ContentResolver cr = getContentResolver();
// 取得电话本中开始一项的光标
Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
null, null, null);
// 向下移动光标
while (cursor.moveToNext()) {
// 取得联系人名字
int nameFieldColumnIndex = cursor
.getColumnIndex(PhoneLookup.DISPLAY_NAME);
String contact = cursor.getString(nameFieldColumnIndex);
// 取得电话号码
String ContactId = cursor.getString(cursor
.getColumnIndex(ContactsContract.Contacts._ID));
Cursor phone = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=
+ ContactId, null, null);
while (phone.moveToNext()) {
String PhoneNumber = phone
.getString(phone
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
string += (contact + ":" + PhoneNumber + "\n");
}
}
cursor.close();
// 设置TextView显示的内容
tv.setText(string);
// 显示到屏幕
setContentView(tv);
}
}

Android短信功能实现源码

一段完整的Android平台上短信功能的接口源码，利用扩展的API可以通过js实现如下功能：

1. getContentUris()：读取短信相关的所有数据库表的Uri地址；

2. get(int number)：读取若干条短信；

3. getUnread(int number)：读取若干条未读短信；

4. getRead(int number)：读取若干条已读短信；

5. getInbox(int number)：从收件箱读取若干条短信；

6. getSent(int number)：读取若干条已发短信；

7. getByThread(int threadID)：读取会话中所有短信；

8. getThreads(int number)：读取若干条会话；

9. getData(String selection, int number)：根据条件读取若干条短信。

源码如下，分享出来：

/*
* Licensed under the Rexsee License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
public class RexseeSMS implements JavascriptInterface {
private static final String INTERFACE_NAME = "SMS";
@Override
public String getInterfaceName() {
return mBrowser.application.resources.prefix + INTERFACE_NAME;
}
@Override
public JavascriptInterface getInheritInterface(RexseeBrowser childBrowser) {
return this;
}
@Override
public JavascriptInterface getNewInterface(RexseeBrowser childBrowser) {
return new RexseeSMS(childBrowser);
}
public static final String CONTENT_URI_SMS = "content://sms";
public static final String CONTENT_URI_SMS_INBOX = "content://sms/inbox";
public static final String CONTENT_URI_SMS_SENT = "content://sms/sent";
public static final String CONTENT_URI_SMS_CONVERSATIONS = "content://sms/conversations";
public static String[] SMS_COLUMNS = new String[] { "_id", // 0
"thread_id", // 1
"address", // 2
"person", // 3
"date", // 4
"body", // 5
"read", // 6; 0:not read 1:read; default is 0
"type", // 7; 0:all 1:inBox 2:sent 3:draft 4:outBox 5:failed
// 6:queued
"service_center" // 8
};
public static String[] THREAD_COLUMNS = new String[] { "thread_id",
"msg_count", "snippet", };
private final Context mContext;
private final RexseeBrowser mBrowser;
public RexseeSMS(RexseeBrowser browser) {
mBrowser = browser;
mContext = browser.getContext();
}
// JavaScript Interface
public String getContentUris() {
String rtn = "{";
rtn += "\"sms\":\"" + CONTENT_URI_SMS + "\"";
rtn += ",\"inbox\":\"" + CONTENT_URI_SMS_INBOX + "\"";
rtn += ",\"sent\":\"" + CONTENT_URI_SMS_SENT + "\"";
rtn += ",\"conversations\":\"" + CONTENT_URI_SMS_CONVERSATIONS + "\"";
rtn += "}";
return rtn;
}
public String get(int number) {
return getData(null, number);
}
public String getUnread(int number) {
return getData("type=1 AND read=0", number);
}
public String getRead(int number) {
return getData("type=1 AND read=1", number);
}
public String getInbox(int number) {
return getData("type=1", number);
}
public String getSent(int number) {
return getData("type=2", number);
}
public String getByThread(int thread) {
return getData("thread_id=" + thread, 0);
}
public String getData(String selection, int number) {
Cursor cursor = null;
ContentResolver contentResolver = mContext.getContentResolver();
try {
if (number > 0) {
cursor = contentResolver.query(Uri.parse(CONTENT_URI_SMS),
SMS_COLUMNS, selection, null, "date desc limit
+ number);
} else {
cursor = contentResolver.query(Uri.parse(CONTENT_URI_SMS),
SMS_COLUMNS, selection, null, "date desc");
}
if (cursor == null || cursor.getCount() == 0)
return "[]";
String rtn = "";
for (int i = 0; i < cursor.getCount(); i++) {
cursor.moveToPosition(i);
if (i > 0)
rtn += ",";
rtn += "{";
rtn += "\"_id\":" + cursor.getString(0);
rtn += ",\"thread_id\":" + cursor.getString(1);
rtn += ",\"address\":\"" + cursor.getString(2) + "\"";
rtn += ",\"person\":\
+ ((cursor.getString(3) == null) ? "" : cursor
.getString(3)) + "\"";
rtn += ",\"date\":" + cursor.getString(4);
rtn += ",\"body\":\"" + Escape.escape(cursor.getString(5))
+ "\"";
rtn += ",\"read\":
+ ((cursor.getInt(6) == 1) ? "true" : "false");
rtn += ",\"type\":" + cursor.getString(7);
rtn += ",\"service_center\":" + cursor.getString(8);
rtn += "}";
}
return "[" + rtn + "]";
} catch (Exception e) {
mBrowser.exception(getInterfaceName(), e);
return "[]";
}
}
public String getThreads(int number) {
Cursor cursor = null;
ContentResolver contentResolver = mContext.getContentResolver();
try {
if (number > 0) {
cursor = contentResolver.query(
Uri.parse(CONTENT_URI_SMS_CONVERSATIONS),
THREAD_COLUMNS, null, null, "thread_id desc limit
+ number);
} else {
cursor = contentResolver.query(
Uri.parse(CONTENT_URI_SMS_CONVERSATIONS),
THREAD_COLUMNS, null, null, "thread_id desc");
}
if (cursor == null || cursor.getCount() == 0)
return "[]";
String rtn = "";
for (int i = 0; i < cursor.getCount(); i++) {
cursor.moveToPosition(i);
if (i > 0)
rtn += ",";
rtn += "{";
rtn += "\"thread_id\":" + cursor.getString(0);
rtn += ",\"msg_count\":" + cursor.getString(1);
rtn += ",\"snippet\":\"" + Escape.escape(cursor.getString(2))
+ "\"";
rtn += "}";
}
return "[" + rtn + "]";
} catch (Exception e) {
mBrowser.exception(getInterfaceName(), e);
return "[]";
}
}
}

就此四大控件已经讲解完毕